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Shor's algorithm with fewer (pure) qubits

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arxiv quant-ph/0601097 v1 pith:B2BKELKU submitted 2006-01-15 quant-ph

classification quant-ph
keywords algorithmqubitsshorfeweradditionsarithmeticcarriedcircuit
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In this note we consider optimised circuits for implementing Shor's quantum factoring algorithm. First I give a circuit for which none of the about 2n qubits need to be initialised (though we still have to make the usual 2n measurements later on). Then I show how the modular additions in the algorithm can be carried out with a superposition of an arithmetic sequence. This makes parallelisation of Shor's algorithm easier. Finally I show how one can factor with only about 1.5n qubits, and maybe even fewer.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Quantum Uncomputation of Clean and Dirty Ancilla Qubits

    cs.PL 2026-08 conditional novelty 8.0 of 10

    Quantum compilers can now automatically uncompute dirty ancillas with a rewrite-based normalizer, and the existence problem is coNP-hard.

  2. Parallel Spooky Pebbling Makes Regev Factoring More Practical

    quant-ph 2025-10 conditional novelty 8.0 of 10

    Parallel spooky pebbling reduces Regev factoring multiplication depth to 193 for 4096-bit N, beating prior Regev variants while remaining space-heavier than Shor.

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